/* ===== Tenses Module Styles — Neon Garden ===== */

/* Container */
.tenses-container {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

/* ===== Tenses Hub Grid ===== */
.tenses-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.tense-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-organic);
    padding: 1.25rem;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-out);
    box-shadow: var(--shadow-sm);
    text-align: left;
    position: relative;
    overflow: hidden;
    font-family: var(--font-primary);
}

/* Colorful top accent stripe per tense card */
.tense-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.tense-card:nth-child(1)::before  { background: linear-gradient(90deg, #00B894, #55EFC4); }
.tense-card:nth-child(2)::before  { background: linear-gradient(90deg, #74B9FF, #A0D2FF); }
.tense-card:nth-child(3)::before  { background: linear-gradient(90deg, #A29BFE, #C8B6FF); }
.tense-card:nth-child(4)::before  { background: linear-gradient(90deg, #FD79A8, #FF9FF3); }
.tense-card:nth-child(5)::before  { background: linear-gradient(90deg, #FDCB6E, #FFEAA7); }
.tense-card:nth-child(6)::before  { background: linear-gradient(90deg, #FF6B6B, #FF8E8E); }
.tense-card:nth-child(7)::before  { background: linear-gradient(90deg, #00CEC9, #55EFC4); }
.tense-card:nth-child(8)::before  { background: linear-gradient(90deg, #6C5CE7, #A29BFE); }
.tense-card:nth-child(9)::before  { background: linear-gradient(90deg, #E17055, #FAB1A0); }
.tense-card:nth-child(10)::before { background: linear-gradient(90deg, #0984E3, #74B9FF); }
.tense-card:nth-child(11)::before { background: linear-gradient(90deg, #6C5CE7, #FD79A8); }
.tense-card:nth-child(12)::before { background: linear-gradient(90deg, #E17055, #FF6B6B); }

.tense-card:hover:not(.locked) {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md), 0 0 16px var(--mod-tenses-glow);
}

.tense-card:active:not(.locked) {
    transform: scale(0.98);
}

.tense-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(0.3);
}

.tense-card.available {
    border-color: var(--accent);
    border-style: dashed;
    animation: card-pulse 3s ease infinite;
}

@keyframes card-pulse {
    0%, 100% { box-shadow: var(--shadow-sm); }
    50% { box-shadow: var(--shadow-md), 0 0 12px var(--accent-glow); }
}

.tense-card.mastered {
    border-color: var(--correct-border);
    background: var(--correct-bg);
}

.tense-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.4rem;
}

.tense-order {
    font-size: 0.72rem;
    font-weight: 800;
    color: white;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-english);
}

/* Colorful order badges */
.tense-card:nth-child(1)  .tense-order { background: linear-gradient(135deg, #00B894, #00A381); }
.tense-card:nth-child(2)  .tense-order { background: linear-gradient(135deg, #74B9FF, #3B82F6); }
.tense-card:nth-child(3)  .tense-order { background: linear-gradient(135deg, #A29BFE, #6C5CE7); }
.tense-card:nth-child(4)  .tense-order { background: linear-gradient(135deg, #FD79A8, #E84393); }
.tense-card:nth-child(5)  .tense-order { background: linear-gradient(135deg, #FDCB6E, #D97706); }
.tense-card:nth-child(6)  .tense-order { background: linear-gradient(135deg, #FF6B6B, #DC2626); }
.tense-card:nth-child(7)  .tense-order { background: linear-gradient(135deg, #00CEC9, #0D9488); }
.tense-card:nth-child(8)  .tense-order { background: linear-gradient(135deg, #6C5CE7, #5A4BD6); }
.tense-card:nth-child(9)  .tense-order { background: linear-gradient(135deg, #E17055, #C0392B); }
.tense-card:nth-child(10) .tense-order { background: linear-gradient(135deg, #0984E3, #0766B4); }
.tense-card:nth-child(11) .tense-order { background: linear-gradient(135deg, #6C5CE7, #A29BFE); }
.tense-card:nth-child(12) .tense-order { background: linear-gradient(135deg, #E17055, #FF6B6B); }

/* ===== Grammar Section ===== */
.grammar-section-header {
    grid-column: 1 / -1;
    margin-top: 1rem;
    margin-bottom: 0.25rem;
    padding: 0.6rem 0;
    border-top: 2px dashed var(--border);
}

.grammar-section-header h3 {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
}

.grammar-card {
    border-color: var(--mod-games);
    background: var(--mod-games-bg);
}

.grammar-card:hover {
    border-color: var(--accent);
    background: var(--accent-bg);
}

.grammar-card.mastered {
    border-color: var(--correct-border);
    background: var(--correct-bg);
}

/* ===== Topic Menu Overlay ===== */
.topic-menu-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: overlayFadeIn 0.2s ease;
}

.topic-menu-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 1.75rem 1.5rem;
    max-width: 320px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: modalSlideUp 0.25s var(--ease-spring);
}

.topic-menu-title {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 0.25rem;
}

.topic-menu-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0 0 1.2rem;
    font-weight: 500;
}

.topic-menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.topic-menu-btn {
    padding: 0.85rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-primary);
    transition: transform var(--duration-fast) var(--ease-spring),
                box-shadow var(--duration-fast);
}

.topic-menu-btn:hover {
    transform: translateY(-2px);
}

.topic-menu-btn:active {
    transform: scale(0.97);
}

.topic-menu-btn.theory-btn {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.topic-menu-btn.practice-btn {
    background: linear-gradient(135deg, #00B894, #00A381);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 184, 148, 0.3);
}

.topic-menu-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: var(--bg-sunken);
    border: none;
    font-size: 1.1rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast);
}

.topic-menu-close:hover {
    background: var(--wrong-bg);
    color: var(--wrong);
}

.grammar-card .tense-order {
    font-size: 1rem;
    background: none !important;
    width: auto;
    height: auto;
}

.tense-status-icon {
    font-size: 1rem;
}

.tense-card-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.1rem;
    line-height: 1.3;
}

.tense-card-name-en {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    font-weight: 500;
    font-family: var(--font-english);
}

.tense-card-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.tense-card-phases {
    display: flex;
    gap: 4px;
}

.phase-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: all 0.3s;
}

.phase-dot.done {
    background: var(--correct);
    box-shadow: 0 0 4px var(--correct-glow);
}

.phase-dot.active {
    background: var(--accent);
    box-shadow: 0 0 4px var(--accent-glow);
    animation: dot-pulse 2s ease infinite;
}

@keyframes dot-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

.tense-accuracy {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    font-family: var(--font-english);
}

/* ===== Theory / Learn Screen ===== */
.theory-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-organic);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    animation: screenEnter 0.35s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.theory-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #6C5CE7, #FD79A8, #FDCB6E);
}

.theory-card-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    margin-top: 0.25rem;
}

.theory-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

/* Formula boxes */
.formula-box {
    background: var(--accent-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
    position: relative;
    overflow: hidden;
}

.formula-box::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    border-radius: var(--radius) 0 0 var(--radius);
    background: var(--gradient-primary);
}

.formula-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.4rem;
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
}

.formula-box:nth-of-type(1) .formula-label { background: var(--correct); color: white; }
.formula-box:nth-of-type(2) .formula-label { background: var(--wrong); color: white; }
.formula-box:nth-of-type(3) .formula-label { background: var(--info); color: white; }
.formula-box:nth-child(n+4) .formula-label { background: var(--warning); color: #1B1F3B; }

.formula-structure {
    font-family: var(--font-english);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    padding: 0.4rem 0.7rem;
    background: var(--bg-sunken);
    border-radius: var(--radius-sm);
    display: inline-block;
    border: 1px solid var(--border);
}

.formula-example {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.formula-example-en {
    font-family: var(--font-english);
    font-style: italic;
    color: var(--text-primary);
    font-weight: 600;
}

.formula-example-vi {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Signal word chips */
.signal-words-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.signal-chip {
    background: var(--accent-bg);
    color: var(--accent);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-full);
    padding: 0.25rem 0.7rem;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-english);
    transition: all var(--duration-fast);
}

.signal-chip:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    transform: translateY(-1px);
}

/* Usage items */
.usage-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.usage-item:last-child {
    border-bottom: none;
}

.usage-rule {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.usage-example {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
    padding-left: 0.75rem;
    border-left: 3px solid var(--accent);
    margin-top: 0.25rem;
    font-family: var(--font-english);
}

/* Notes */
.note-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
    line-height: 1.6;
}

.note-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient-primary);
}

/* Exercise Screen */
.exercise-type-badge {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: white;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    padding: 0.3rem 0.9rem;
    display: inline-block;
    margin: 0 1rem 0.5rem;
    box-shadow: 0 2px 8px var(--accent-glow);
    width: fit-content;
}

.exercise-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-organic);
    padding: 1.75rem 1.25rem;
    text-align: center;
    margin: 0 1rem 0.75rem;
    box-shadow: var(--shadow-md);
    transition: all var(--duration-normal);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.exercise-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 22px;
    background: var(--gradient-accent);
    z-index: -1;
    opacity: 0.08;
}

.exercise-card.correct-highlight {
    border-color: var(--correct);
    box-shadow: 0 0 0 3px var(--correct-glow), var(--shadow-md);
}

.exercise-card.correct-highlight::before {
    background: linear-gradient(135deg, #00B894, #55EFC4);
    opacity: 0.15;
}

.exercise-card.wrong-highlight {
    animation: cardShake 0.3s ease;
}

.exercise-prompt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    line-height: 1.5;
}

.exercise-sentence {
    font-family: var(--font-english);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.6;
}

.exercise-blank {
    color: var(--accent);
    border-bottom: 3px dashed var(--accent);
    padding: 0 4px;
    font-weight: 700;
    background: var(--accent-bg);
    border-radius: 4px 4px 0 0;
}

.exercise-verb-hint {
    font-size: 0.85rem;
    color: var(--accent);
    margin-top: 0.5rem;
    font-style: italic;
    font-weight: 600;
    background: var(--accent-bg);
    display: inline-block;
    padding: 0.2rem 0.7rem;
    border-radius: var(--radius-full);
    font-family: var(--font-english);
}

/* Explanation Box - override from style.css for tenses-specific styling */
.tenses-container .explanation-box {
    background: var(--accent-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin: 0 1rem 0.75rem;
    animation: screenEnter 0.3s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.tenses-container .explanation-box::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
}

.tenses-container .explanation-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: white;
    background: var(--gradient-primary);
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
    margin-bottom: 0.4rem;
}

.tenses-container .explanation-text {
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Page indicator override */
.tenses-container .page-indicator {
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    padding: 0.25rem 0.65rem;
    box-shadow: 0 2px 6px var(--accent-glow);
    font-family: var(--font-english);
}

/* Theory nav override */
.tenses-container .theory-dots {
    display: flex;
    gap: 6px;
}

.tenses-container .theory-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: all 0.3s;
}

.tenses-container .theory-dot.active {
    background: var(--gradient-primary);
    width: 24px;
    border-radius: 4px;
    box-shadow: 0 1px 4px var(--accent-glow);
}

/* ===== Responsive ===== */
@media (min-width: 640px) {
    .tenses-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    .tenses-grid {
        grid-template-columns: repeat(3, 1fr);
        padding: 0 1rem 2rem;
    }

    .tenses-container {
        padding: 0 1.5rem 2rem;
    }
}

@media (max-width: 380px) {
    .tenses-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem 2rem;
    }

    .exercise-sentence {
        font-size: 1rem;
    }

    .exercise-card {
        padding: 1.25rem 1rem;
    }
}